Screw thread upsetting tool



Jan. 15, 1952 w, w WYNNE 2,582,519

SCREW THREAD UPSETTING TOOL Filed April s, 1948 /Zvvfwra/e n W W WHY/Vf .er

Patented Jan. 15, 1952 UNITE-D ATENT OFFICE soaEWTHREAD UPsE''I'NG 'root'. Walterv W; AWynnci Berwyii, 111:, assigner to Western Electric Company', Incorporated,` New York, N. Y., a corporation rof New York Application April 8, 1948; lSiatl No.' 19,;1'17r a screw-threaded bolt to prevent nuts from being accidentally run off the bolt.

An object of the invention is the provision of a simple and eficient screw thread upsetting tool.

In accordance with the above object, in one embodiment of the invention, particularly designed for spinning or deforming the outer end screw threads, for example, one and one-half screw threads of a bolt having a nut previously positioned thereon to prevent it from freely running ofl, there is provided a screw thread upset ting tool comprising a body member which, at its mounting end, may be clutched to a rotary driving member. At its working end, the tool is of circular cross-section and provided with a circular depression which is formed at its open end with a conical guiding surface terminating in stepped annular shouldered surfaces having diameters corresponding, respectively, to the major and pitch diameters of the screw threads to be deformed. The depth of the last step is so dimensioned that it is equal to at least one-half oi' the pitch of the screw thread and the depression terminates in a clearance diameter equal to the minor diameter of the screw thread.

@ther objects and advantages of the invention will more fully appear from the following detailed description taken in conjunction with the accompanying drawing, in which Fig. l is an elevational view of a rotary screw thread upsetting tool embodying the features of this invention shown clutched to a portable air driven power unit and in position to engage the face of a screwdzhreaded bolt;

Fig. '2 is an enlarged fragmentary central 1ongitudinal section through the tool shown in Fig. 1 just before engaging the end face of a bolt;

Fig. 3 is a similar view of the tool and bolt upon completion of a screw-thread upsetting operation on the end screw threads of the bolt, the bolt being shown in section; and

fi is a bottom plan view of the tool.

Referring to the drawing and more particularly to Fig. l, one embodiment of the invention is shown applied, for example, to a conventional type portable air driven tool it, the air for driving the rotor of the tool (not shown) being supplied by means cf a hose Il, which may be connected to a source of air under pressure. lower end, the tool iii has a chuck I3 for supporting a screw thread upsetting or spinning tool is embodying the features of this invention.

At its.

2 claims. (c1. iii- 53) The spinning tool E it, referring now to Figs. 2, 3, and 4, which fragmentarily illustrates the lower end of the' tool on a greatly enlarged scale compared to the tool as shown in Fig. 1, comprises a body member which, at its lower or working end l5, is of circular cross-section, the upper or mounting end (not shown) being of reduced` diameter and ofirregular cross-section for insertion in the chuck i3. At the working end i5 of the tool there is provided a circular depression i3 having several diameters. The open end of the depression I8 is formed with a conical mouth or guiding surface i9, which terminates in two stepped annular shouldered surfaces having diameters, indicated at 2t and 2i, corresponding to the major and pitch diameters, respectively, of a screw-threaded bolt 2li, the outer end threads of which are to be upset or deformed by spinning. The depth of the last step, having the diameter indicated at 2l, is equal to at least one-half of the pitch of the screw thread of the bolt 24. A clearance diameter is preferably provided at the inner end of the depression i8, as indicated at 25, which should be approximately equal to the minor diameter of the screw thread of the bolt 2d.

In using the spinning tool lil, it is driven at high speed, for example, 2500 R. P. M., and high torque by the air driven tool lil, and may be lowered by the operator and guided by the conical surface I9 of the tool into axially aligned engagement with the upper end of the screw-threaded bolt 24, as shown in Figs. l and 2. By exerting suitable longitudinal pressure on the tool I0, while the spinning tool Id is engaged with the screw threaded end of the bolt 2d and is being driven at high speed with a high torque, the end threads, or preferably one and one-half threads of the bolt, will be spun or deformed sufficiently out of normal position, as indicated at 26 and 27 (Fig. 2) and completely around the bolt to prevent a nut 28 (Fig. 1) previously positioned on the bolt from freely turning or running oi the bolt.

In the particular example chosen for illustration, the spinning tool lil is shown deforming the screw threads of a bolt 24, which has been assembled with a strip or block 3d, the screwthreaded end of the bolt extending from the block and having a nut 28 threaded onto it. As thus assembled with the bolt 2li and nut 23, the block 30 is mounted as shown on an L shaped support 32 to prevent it from rotating and provide a rm base whereby when the tool is engaged with the end of the bolt, the threads will be deformed as illustrated in Fig. 3.

It is to be understood that the above-described arrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

l. An upsetting tool comprising a cylindrical body having an upsetting cavity in its free end, said cavity being dened by a funnel shaped guiding entrance, an annular upsetting shoulder extending transversely of said body at the inner end of said funnel entrance, a cylindrical Wall concentric With said body and extending inwardly from the inner periphery of said annular shoulder, a second annular upsetting shoulder extending transversely of said body at the inner end of said cylindrical Wall, and a second cylindrical wall concentric with said body extending inwardly from the inner periphery of said second annular shoulder to the bottom of said cavity.

2. A spinning tool for upsetting the end threads of an exteriorly threaded member comprising a body member rotatable about its axis and having an upsetting cavity at its free end coaxial with said axis, said cavity being dened by a funnel shaped guiding entrance, an annular upsetting shoulder extending transversely of said axis at the inner end of said funnel shaped entrance, an annular wall extending inwardly from the inner periphery of said annular shoulder in concentric relation to said axis, a second annular upsetting shoulder extending transversely of said axis at the inner end of said annular wall, and a second annular wall concentric with said axis extending inwardly from the inner periphery of said second annular shoulder.

WALTER W. WYNNE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

